我们的网站为什么显示成这样?

可能因为您的浏览器不支持样式,您可以更新您的浏览器到最新版本,以获取对此功能的支持,访问下面的网站,获取关于浏览器的信息:

|Table of Contents|

思茅松、云南松脂松香的物理和化学特征(PDF)

《南京林业大学学报(自然科学版)》[ISSN:1000-2006/CN:32-1161/S]

Issue:
2004年02期
Page:
57-60
Column:
研究论文
publishdate:
1900-01-01

Article Info:/Info

Title:
The Physicl and Chemical Characteristics of Gum Rosin from Simao Pine and Yunnan Pine
Article ID:
1000-2006(2004)02-0057-04
Author(s):
YIN Xiao-bingGENG Shu-xiang
Yunnan Academy of Forestry,Kunming 650204,China
Keywords:
Pinus kesiya var.langbinanensisPinus yunnanensisGum rosinPhysical characteristicsChemical characteristics
Classification number :
TQ351.47
DOI:
10.3969/j.jssn.1000-2006.2004.02.014
Document Code:
A
Abstract:
The physical and chemical characteristics of gum rosin from Simao pine(Pinus kesiya var.langbinanensis) and Yunnan pine(Pinus yunnanensis) of Yunnan were studied.They were softening point(ring & ball),acid number,unsaponifiable matter,ethanol insoluble matter,ash,optical rotation and chemical compositions.There were 79 samples of gum rosin from Simao pine and 21 samples of gum rosin from Yunnan pine.They were from 11 producing areas of Simao pine and 4 producing areas of Yunnan pine.The results showed that averages of quality index of two gum rosins were superior to the technology required in GB/T 8145-87 and difference was not significant compared with those of Chinese.The chemical compositions of two kinds gum rosin in descending order were the same.They were abietic acid,palustric acid,neoabietic acid,dehydroabietic acid and communic acid.The significant level of optical rotations in enterprises was F=33.844 8>F _(0.001,6,58)=4.395 8.Correlation between optical rotation and chemical compositions of gum rosin from Simao pine which palustric acid,abietic acid,dehydroabietic acid,isopimaric acid were that r_(0.001,12-2)=0.933 2~(***),r_(0.001,12-2)=-0.942 5~(***),r_(0.05,12-2)=-0.657 5~*,r_(0.05,12-2)=-0.693 9~*.

References

-

Last Update: 1900-01-01